Free flowing SBR black masterbatch powder
US4375497A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 27, 1981 |
| Grant date | Mar 1, 1983 |
| Priority date | — |
| Expiry date | Aug 27, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2998
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
There is disclosed a process for the production of tack-free, pourable, filler containing elastomer powder which comprises PA1 (a) dispersing a carbon black filler in water; PA1 (b) mixing the thus dispersed carbon black filler with an elastomer latex; PA1 (c) coagulating the thus produced mixture of elastomer latex and carbon black with an acid/alum solution; PA1 (d) partitioning the thus coagulated suspension with a coating resin; and PA1 (e) filtering, washing and drying of the resultant powder, the improvement comprising using as a coating resin a mixture of a styrene/butadiene resin and a styrene/.alpha.-methylstyrene or a polystyrene resin wherein the weight ratio of the styrene/butadiene resin to the styrene/.alpha.-methylstyrene or polystyrene resin ranges between 4/1 and 1/4, said resins containing a mixture of added surfactants, the first being sodium lauryl sulfate and the second being a nonionic isooctyl phenoxy polyethoxy ethanol which contains 10 moles of ethylene oxide in the polyethoxy portion thereof, said mixture of surfactants being added in an amount at least 4 percent by weight and being in a weight ratio of sodium lauryl sulfate to the nonionic surfactant rang…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.